Board Thread:Pokémon Help/@comment-31398341-20171026040947/@comment-27535813-20180101073107

There is no question as to how good Gothitelle is, it's fairly good in this current meta as it effectively puts a stop towards any Stall teams by isolating one of the Pokemon and breaking apart its core/team structure. It can spam calm mind on passive mons rather easily and then use Psyshock when the time is right(and therefore sweep). Rest gives it access to recovery, and it has a lot of utility moves to keep its team(or mainly itself) alive. (e.g. Taunt/Toxic/Charm/Trick Room/T-Wave/Tickle)

However, as a Shadow Tag user, it is slightly outclassed by Mega Gengar due to its far larger offensive presence, speed and being able to pick off kills much more quickly. The thing that differentiates it from Mega Gengar is due to its relatively better bulk. As it is better off just remove tanky checks in general, it doesn't really have much usage outside of that, sadly. It's physical bulk(which can be invested in, but not to much when you have a better special bulk instead), means it's easy to kill by Pokemon such as Mega Salamence, Marshadow and Mega Kangaskhan(all are subsceptible to Charm if they switch into Gothitelle, but weaknesses+wallbreakers in general as well as set-up options they have means they can break through), although it shouldn't be switching into them anyway. It also suffers 4 moveslot syndrome, so it always runs out of another thing it can possibly use instead to counter the opposing team(such as beating out Ferrothorn and Skarmory w/ Tickle).

Note: Trick is also a viable (move tutor) move, but since Choice items aren't out yet it's mostly limited and pointless to run on Gothitelle. When Choice Specs/Scarf does come out, it can possibly run a niche wallbreaker set, but this is mostly outclassed by other wallbreakers that can do a lot more damage with their better base damaging stats and potentially naturally good speed, allowing them to hold an item that increases damage output and also mean that they can switch between moves. Heal Bell is also another viable (move tutor) move which is mostly self-explanatory. There also other moves like Swagger, Embargo, Heal Block, Flatter and Fake Tears but they're generally less useful and more situational.

General calculations as to what it can beat:

Toxapex:

+2 0 SpA Gothitelle Psyshock vs. 252 HP / 252 Def Toxapex: 194-230 (63.8 - 75.6%) -- guaranteed 2HKO

+2 0 SpA Gothitelle Psyshock vs. 252 HP / 4 Def Toxapex: 230-272 (75.6 - 89.4%) -- guaranteed 2HKO

Chansey:

+4 0 SpA Gothitelle Psyshock vs. 0 HP / 252+ Def Eviolite Chansey: 327-385 (51 - 60%) -- guaranteed 2HKO

+4 0 SpA Gothitelle Psyshock vs. 248 HP / 252+ Def Eviolite Chansey: 327-385 (46.5 - 54.7%) -- 64.5% chance to 2HKO

Clefable: (Magic Guard; Unaware pretty much walls it if Gothitelle doesn't have Toxic)

+4 0 SpA Gothitelle Psyshock vs. 252 HP / 252+ Def Clefable: 217-256 (55 - 64.9%) -- guaranteed 2HKO

Conclusion: It's mostly just to take away certain threats towards the team, in particular walls/tanks, thus acting as a Stallbreaker. The other thing it can do is tank special hits rather well and set-up on such Pokemon. This means that it can be deadweight otherwise if it does not have any opportunity to set up or wall Pokemon if it's mainly played against an offensive team, which means it should at least be a B/B- Pokemon.